grunt-stripmq is a Grunt task to generate a fallback version of your fancy mobile first stylesheet. Since IE8 and lower dont support media queries, you can use a javascript library like respond.js to enable this, or generate a fallback version on build-time with this task.

The options object is used to specify a "viewport" that you want your old IE users to see. The media queries in your mobile-first stylesheet will be compared against the properties of the options object.